Lennox XP25-024-230-01 Installation And Service Procedure page 33

Table 6. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes
NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification).
Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert
codes are also displayed on the iComfort Wi-Fi
Inverter LED Flash
Code (number of
Alert Inverter
flashes)
Code
Codes
Red LED
E 429 23 2 flashes
E 430 26 2 flashes
E 431 27 2 flashes
E 432 28 2 flashes
E 433 29 2 flashes
®
thermostat.
Priority
Green LED
On a call for compressor op­
eration, if DC link power in
inverter does not rise above
180 VDC for 2 and 3 ton
models, 250 VDC for 4 and
5 ton models, within 30
seconds, the control will dis­
Moderate play a moderate code. If
3 flashes
/ Critical condition is detected, out­
door unit will stop (Com­
pressor and fan). Anti-short
cycles is initiated. If condi­
tion occurs 10 times within a
60 minute rolling time peri­
od, system will lock out and
display a critical code.
Moderate
6 flashes Compressor start failure
/ Critical
Error occurs when PFC de­
tects an over-current condi­
tion of 100A, the control will
display a moderate code. If
condition is detected, out­
door unit will stop (Com­
pressor and fan). Anti-short
Moderate
7 flashes cycle is initiated. Inverter is
/ Critical
unavailable to communicate
with the outdoor control for
3 minutes. If condition oc­
curs 10 times within a 60
minute rolling time period,
system will lock out and dis­
play a critical code.
The inverter has detected a
Moderate
DC link high voltage condi­
8 flashes
/ Critical
tion.
The inverter has detected a
Moderate
compressor over-current
9 flashes
/ Critical
condition
Alarm Description
Issues:
(1) If DC link power in inverter does not rise above 180
VDC for 2- and 3-ton models, 250 VDC for 4- and 5-ton
models, within 30 seconds, the outdoor control will dis­
play a moderate code.
(2) Capacitors on inverter do not properly charge.
Corrective Actions:
(1) check for proper main power to outdoor unit and for
any loose electrical connections.
(2) Outdoor control boards with part # 103686-03 have
software update to delay the de-energizing of the re­
versing valve by four seconds when coming out of de­
frost.
If condition is detected, outdoor unit compressor and
fan stop. Anti­short cycle is initiated. If condition occurs
10 times within an hour, system is locked out.
Indicates poor connection at compressor harness, im­
.
proper winding resistance, locked compressor rotor, or
flooded compressor.
To clear, disconnect power to outdoor unit and restart.
Issues:
(1) Indicates power interruption, brownout, poor elec­
trical connection or loose inverter input wire.
(2) System testing was set up and code was gener­
ated when the reversing valve is de-energized coming
out of defrost (code appears with or without 30 com­
pressor delay).
Corrective Actions:
(1) Check for proper main power to outdoor unit and
for any loose electrical connections.
(2) Outdoor control boards with part # 103686-03 have
software update to delay the de-energizing of the re­
versing valve by four seconds when coming out of de­
frost.
Error occurs when the DC link capacitor voltage is greater
than 480VDC. If condition is detected, outdoor unit com­
pressor and fan stop. Anti­short cycle is initiated. If condi­
tion occurs 10 times within an hour, system is locked out.
System stops. To clear, disconnect power to outdoor unit
and restart.
Error occurs when compressor peak phase current is
greater than 28A. Inverter issues code 14 first and slows
down to try to reduce the current. If the current remains
high, outdoor unit compressor and fan stop. Anti­short
cycle is initiated. If condition occurs five times within an
.
hour, system is locked out. To clear disconnect power to
outdoor unit and restart.
Page 33
Possible Causes and Clearing Alarm
XP25